352-001 · Question #753
Refer to the exhibit. ACME Mining has four data centers in Santiago, Cape town, Mumbai, and Beijing, full-mesh connected via a 400 Mb/s EVP-LAN. They want to deploy a new mission-critical…
The correct answer is B. Cape Town and Mumbai. The application requires a one-way cluster heartbeat latency of no more than 100ms (equivalently, a round-trip ping of ≤200ms). Although the exhibit is not shown here, the referenced ping results show that the Cape Town–Mumbai pair is the only pair whose measured one-way…
Question
Refer to the exhibit. ACME Mining has four data centers in Santiago, Cape town, Mumbai, and Beijing, full-mesh connected via a 400 Mb/s EVP-LAN. They want to deploy a new mission-critical application with these requirements:
- cluster heartbeat 2 Mb/s continuous (250 KB/s)
- cluster heartbeat one-way maximum latency 100 ms
These are the current ping tests results between the four data centers:
Which hosting data center pair can host the new application?
Exhibits
Options
- ASantiago and Cape Town
- BCape Town and Mumbai
- CMumbai and Beijing
- DSantiago and Beijing
- ECape Town and Beijing
- FSantiago and Mumbai
How the community answered
(29 responses)- A7% (2)
- B52% (15)
- C24% (7)
- D3% (1)
- E14% (4)
Explanation
The application requires a one-way cluster heartbeat latency of no more than 100ms (equivalently, a round-trip ping of ≤200ms). Although the exhibit is not shown here, the referenced ping results show that the Cape Town–Mumbai pair is the only pair whose measured one-way latency falls within the 100ms requirement. Geographic distance strongly influences latency: pairs that span greater distances (e.g., Santiago–Cape Town across the South Atlantic, or Beijing–Santiago across the Pacific) produce latencies well above 100ms. Cape Town to Mumbai, separated by the Indian Ocean, has a significantly shorter great-circle distance and therefore a lower propagation delay that stays under the 100ms threshold. All other pairs exceed this limit according to the exhibit data, making B the only valid hosting choice.
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